Charles H. Wilts (1960). Principles of Feedback Control. Addison-Wesley Pub. Co. p. 1. https://archive.org/details/principlesoffeed00wilt. "In a simple feedback system a specific physical quantity is being controlled, and control is brought about by making an actual comparison of this quantity with its desired value and utilizing the difference to reduce the error observed. Such a system is self-correcting in the sense that any deviations from the desired performance are used to produce corrective action."
Arkalgud Ramaprasad (1983). “On The Definition of Feedback”. Behavioral Science28 (1): 4–13. doi:10.1002/bs.3830280103.
Herold, David M.; Greller, Martin M. (1977). “Research Notes. Feedback: The Definition of a Construct”. Academy of Management Journal20 (1): 142–147. doi:10.2307/255468. JSTOR255468.
Giannini, Alessandra; Biasutti, Michela; Verstraete, Michel M. (2008-12-01). “A climate model-based review of drought in the Sahel: Desertification, the re-greening and climate change”. Global and Planetary Change64 (3): 119–128. Bibcode: 2008GPC....64..119G. doi:10.1016/j.gloplacha.2008.05.004. ISSN0921-8181.
Giannini, Alessandra; Biasutti, Michela; Verstraete, Michel M. (2008-12-01). “A climate model-based review of drought in the Sahel: Desertification, the re-greening and climate change”. Global and Planetary Change64 (3): 119–128. Bibcode: 2008GPC....64..119G. doi:10.1016/j.gloplacha.2008.05.004. ISSN0921-8181.
Herold, David M.; Greller, Martin M. (1977). “Research Notes. Feedback: The Definition of a Construct”. Academy of Management Journal20 (1): 142–147. doi:10.2307/255468. JSTOR255468.
Giannini, Alessandra; Biasutti, Michela; Verstraete, Michel M. (2008-12-01). “A climate model-based review of drought in the Sahel: Desertification, the re-greening and climate change”. Global and Planetary Change64 (3): 119–128. Bibcode: 2008GPC....64..119G. doi:10.1016/j.gloplacha.2008.05.004. ISSN0921-8181.